Like fellow member Minho, he was born in the Chinese Year of the Ram. He’s a Libra. He’s 181 cm or 5'11½" tall. Key, Minho, and Taemin share the blood type B.

He attended Dae Gu Yeong Shin Middle School. He speaks Japanese and Mandarin. He speaks the best English in the group. He’s an only child. He was reared by his grandmother, since his mother was in poor health immediately after his birth and his father was busy with work.

He became an SM trainee in 2005. He dreamt of becoming a singer since kindergarten.

He collaborated with SNSD for “Boys & Girls” on their Oh! album. He performed at SNSD’s concerts on “Barbie Girl” with Jessica and “If You Find a Cool Guy, Please Introduce Me” with Yoona. He rapped on EXO’s “Two Moons.” He also appeared in Attack of the Pin-up Boys.

He formed the group Toheart with Infinite’s Woohyun, releasing an album in 2014.

He starred in the 2016 drama “Drinking Alone” and has been in several musicals.

He has the best fashion sense of the Shinee members. He goes into CD stores and asks, “Where are the SHINee CDs? Are they selling well?”

His hobby is water skiing. He has a love-hate relationship with horror movies and scary stories. He’s afraid of heights.

Key is confident that he could make it as a gourmet chef. He says that no one can escape his dumplings trap.